板栗旋纹潜叶蛾生物学特性及防治

Bionomics and control of Leucoptera scitella in chestnut trees

旋纹潜叶蛾Leucoptera scitella Zeller是危害板栗的主要害虫,在浙江省绍兴市1a发生4代。以蛹在枝干树皮缝或枝叉处结茧越冬,翌年4月中旬越冬代成虫羽化并产卵,4月下旬第1代幼虫孵化,5月中旬幼虫老熟并结茧,5月下旬1代成虫羽化并产卵。6月上旬第2代幼虫孵化,下旬化蛹,7月上旬第2代成虫羽化并产卵,7月中旬第3代幼虫孵化,8月上旬化蛹、成虫羽化并产卵,8月中旬出现第4代幼虫,9月下旬开始结茧化蛹越冬。在第1代幼虫期,用1.8%阿维菌素乳油1000倍液、5%吡虫啉乳油1000倍液和生绿Bt可湿性粉剂800倍液喷雾防治,5d后效果分别达到97.2%,98.0%和85.7%。

Leucoptera scitella is a major pest attacking chestnut trees. It has 4 generations a year in Shaoxing and overwinters in stem bark crevices and branches as pupa in cocoon. The overwintering adult emerges and lays eggs in mid April the next year. The larvae of the lst,2nd ,3rd and 4th generations hatch in the last ten days of April, early June , mid July and mid August respectively and pupate in mid May, the last ten days of June, early August and the last ten days of September. The adults of the lst,2nd and 3rd generations emerge and lay eggs in the last ten days of May,early July and early August. Spraying of 1.8 % Avermectin EC 1 000 times, 5 % imidacriplod EC 1 000 times and Shenlu Bt WP 800 times in the larval stage of the first generation can kill 97.2% ,98.0% and 85.7% of the pest 5 days after the application.